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AUSCERT External Security Bulletin Redistribution
ESB-2009.1405
Vulnerabilities in Windows CryptoAPI Could Allow Spoofing
14 October 2009
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AusCERT Security Bulletin Summary
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Product: Microsoft Windows
Publisher: Microsoft
Operating System: Windows 2000
Windows XP
Windows Server 2003
Windows Vista
Windows Server 2008
Windows 7
Impact/Access: Provide Misleading Information -- Remote/Unauthenticated
Resolution: Patch/Upgrade
CVE Names: CVE-2009-2511 CVE-2009-2510
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/ms09-056.mspx
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Microsoft Security Bulletin MS09-056 - Important
Vulnerabilities in Windows CryptoAPI Could Allow Spoofing (974571)
Published: October 13, 2009
Version: 1.0
General Information
Executive Summary
This security update resolves two publicly disclosed vulnerabilities in
Microsoft Windows. The vulnerabilities could allow spoofing if an attacker
gains access to the certificate used by the end user for authentication.
This security update is rated Important for all supported editions of
Microsoft Windows 2000, Windows XP, Windows Server 2003, Windows Vista,
Windows Server 2008, and Windows 7. For more information, see the subsection,
Affected and Non-Affected Software, in this section.
The security update addresses the vulnerabilities by modifying the CryptoAPI
to reject certificate names that contain null terminators, and to correctly
validate ASN.1 object identifiers.
Recommendation. The majority of customers have automatic updating enabled and
will not need to take any action because this security update will be
downloaded and installed automatically. Customers who have not enabled
automatic updating need to check for updates and install this update
manually. For information about specific configuration options in automatic
updating, see Microsoft Knowledge Base Article 294871.
For administrators and enterprise installations, or end users who want to
install this security update manually, Microsoft recommends that customers
apply the update at the earliest opportunity using update management
software, or by checking for updates using the Microsoft Update service.
Known Issues. None
Affected Software
Microsoft Windows 2000 Service Pack 4
Windows XP Service Pack 2 and Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2
Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit
Systems Service Pack 2 (Windows Server 2008 Server Core installation
affected)
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2 (Windows Server 2008 Server Core
installation affected)
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems
Windows 7 for x64-based Systems
Windows Server 2008 R2 for x64-based Systems (Windows Server 2008 R2 Server
Core installation affected)
Windows Server 2008 R2 for Itanium-based Systems
Vulnerability Information
Null Truncation in X.509 Common Name Vulnerability - CVE-2009-2510
A spoofing vulnerability exists in the Microsoft Windows CryptoAPI component
when parsing ASN.1 information from X.509 certificates. An attacker who
successfully exploited this vulnerability could impersonate another user or
system.
Integer Overflow in X.509 Object Identifiers Vulnerability - CVE-2009-2511
A spoofing vulnerability exists in the Microsoft Windows CryptoAPI component
when parsing ASN.1 object identifiers from X.509 certificates. An attacker
who successfully exploited this vulnerability could impersonate another user
or system.
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